Rule 10.12 – Puck Out of Sight and Illegal Puck

At any time where the Referee loses sight of the puck, play shall be stopped. The resulting face-off shall be at the point where play was stopped, unless otherwise stated in the rules.
If, while play is in progress, a puck other than the one legally in play appears, the play shall not be stopped, but shall continue with the legal puck until the play then in progress is completed.

SITUATION 1 Rule 10.12 (b)

Where a second puck appears on the ice, allow play to be completed if the second puck in no way affects the legal puck. Stop play when the play has been completed, unless one of the Officials picks up the second puck.

Note 1: When possible, Officials should make every attempt to pick up the second puck in order that play may continue.

Note 2: If a player deliberately shoots the second puck at an opposing player in possession and control of the legal puck, assess a Minor penalty for Interference under Rule 7.3. If the player in possession and control of the legal puck is on a breakaway in the attacking or neutral zone and the second puck is shot at them, this gesture shall be considered as fouling from behind and Rule 7.4 (d) - Tripping, shall apply, meaning that a Penalty Shot shall be awarded against the offending team if the player on the breakaway in the neutral or attacking zone was prevented from having a clear shot on goal.